Double-drum hoist



March 2,1926. 1,574,910

E. B. LEAR DOUBLE DRUM HOIST Filed July 15, 1925 INVENTOR .EoaLB-Leaz HIS ATTORN Y Patented Mar. 2, 1926.

UNITED PATENT EARL LB. LEAR, 0F rHIL r-rsiwne, NEW JERSEY, ssrenon T 0 'INGFEERSQLDRA'ND COMPANY, 01 JERSEY on y, NEWJERSEY, A CORPORATION on NEW JERSEY.

DOUBLE-DRUM I-IOIST.

Application filed July 15, @925. Serial no. 43,637.

To all whom it may concern:

Beit known that I, EARL B. LEAR, a citizen of theUnited'States, and a resident of Phillipsburg, county of Warren, and State 5 of New Jersey, have invented a certain Double-Drum Hoist, of which the following is a specification accompanied by drawings.

This invention relates to hoists, but more particularly to a power driven hoist ofthe double drum type. v

The objects of this invention areto enable twodrums as for instance, a haulage drum and atail-rope drum, to be connected selectively with a common driving shaft.

Another object is to simplify the construction and to insure ease and certainty of open ation in devices for automatically connecting one drum With adriving shaft and simul taneously disconnecting the other drum from the driving shaft in accordance with the direction of rotation of theshaft.

Other bject i ei- Par Po nte ou hereinafter.

The invention consists of the combinations of elements, features ,ofeonstruction, and arrangement of part ha ng h gene a mode of operation substantially as hereinafter described and more particularly pointed out in the appended claims and illus- 3 trated in the a ompanying d aw ng, sil

which Figure 1 is ,a longitudinal sectionalele- Nation of the hoist taken on the line ;1.1 .of:Figure 2 looking inthe direction of the arrows,

Figure 2 is a transverse sectional yiew taken on the line 2+2 of Figure '1 looking in the, direction of the arrows, and

Figure 3. is anenlarged detail perspective view of the pawl. j

Referring'to the drawing, the base plate A upon which the hoist is supported is in thi nsta c sw ve yzm ntc 011 th bed plate B to enable the hoist to be liotatably adju t d in a y desi d p sit n abou a v tieal axis. Any suitable motor may be provided for the hoist and in this instance a fluid pressure motor is indicated, havinga casing C mounted on the base plate A, one end of which casing is closed by a plate D. Fluid pressure, as for instance compressed air, is supplied to the motor-through the suitable inlet (not shown) controlled by a suitable yalve E in the valve chest F adapted to be manipulated-by the valve lever Gr, ln

con rolled by h a leyer sear hoe: y means ofhol The ble and Permit eady ccess h ty tot opera e Pa t o theho tsea o h ma n driver Y P terably th te m of a hello his'i ah th mot ri essumed who a revers ble motor, the reversalof which is A c e h ar g how n this i stance asa. tubular supportin the form of a shell, .60

is S ppor ed at q c di t s e hoxJ .a 1.1 .-$ecnr t r by th ce te hearing r t i ng; cr hich secure t e center e r g to th i nerns lot thesoar hex J h gear o cover L sc uredtotthe 9 o i ho-f the to a d -;fra1.11 sofa-r: dc-

.sor hed has mih um tpartei s-t1ong and compact, easily assembled and disassem- A iing shaft P Passi g long tudina y th oug th cente hea ing H i upport d on nd i th ant riction oatload and i conn cted o he ro a-t d by. t emotor; 1 -2 any ui e ne A riyihg Phi ip R i p e e ei lylkyedto thedr f ng Shaft an wit an iintcnac liete g ar 5 iournelcd o th c unte s af Timo hte i theeea ho he inte z' hed a S n is prcy ded with h arings U and hdah interm diate m lion W in hi i s a ce ri; s

a Pei-"tion of he ntermediat ecar. S with an inte na rotatab e see adapted to rot te oil-theme. bearing P W-c1: .is-taken-f the. m n d ve 9 dri ing ther one of t e ti ofrlrems and a oosely. m unt d relat e t th 9 d ve Y a d atahl shou th d ivin s a t? t w ll hu be en that th wil shiver LY: i onnec ed a by mean his to th imi dli l sish ft P and o the drums at is conveniently journaledon the ee crb a ihgI- The haulage drum on, to which one length of the cable Z) is adapted it to be connected,

rotatespreferablyupon a bushing c upon the center bearing Hand the tail rope dru n Z which is in this instance mounted beside thedru n ain line therewith and to which the tail rope ,d is connected, preferably rotates upon the main driver Y as a convenient and compact construction. Such construc- 1.0 tion of the drums materially reduces the over-all length of the hoist and produces a compact and well balanced hoist. Although one of the drums is shown journaled .on. the cen er hear g and the'ot wr-d nm ie naled U0 upon the main driver, it is to'b'e understood that this construction is merely shown for illustrative purposes and as this arrangement forms no part of the present invention, this invention is not limited to the construction shown except as defined by the appended claims.

Means are provided for automatically connecting the main driver Y to one or the other of the drums Z and a in accordance with the direction of rotation of the driving shaft P and for this purpose the haulage drum 1 is provided with a driver having clutch members in the form of teeth 6. The teeth 6 are in this instance shown formed on a flange 7 of the drum (1 but it is to be understood that they may be formed on a member separate from the drum a if desired and suitably secured thereto. The tail rope drum Z is likewise provided with a driver having clutch members in the form of teeth gformed on the drum flange h but facing in the opposite direction from the teeth 6. v i

A pawl carrier in this instance comprises a pair of annular plates or idlers j and is which are adapted to rotate relative to the center bearing H. The idler j inthis instance bears directly on the center bearing H and the idler 7c in this instance bears on the main'driver Y. Pins 0- hold the idlers j and la in separated relationship and a pawl 0 is in this instance pivotally mounted on one of the pins 0. Thepawl p is preferably formed with opposed engagingsurfaces g and 0* which are adapted to engage a tooth e or g on the drums at and Z respectively, in accordance with the direction of rotation of the driving shaft P and consequent rotation" of the main driver Y. Although but one pawl is shown on the drawing, it is to be understood that as many pawls as necessary may be used and each pawl is adapted to rock vertically about a pin 0 and when one of the engaging surfaces 9 and r engage a tooth on one or the other of the drums, the opposite engaging surface is out of engagement. In this manner, when'one drum is being driven the other drum is free to rotate independently thereof.-

In order to actuate the pawl 29 into engagement with the tooth on one or the other of the drum drivers, the'pawl p is preferably provided with gear teeth 8 formed in its underface to mesh with similar gear teeth t formed on an annular ring u. The ring u is preferably keyed to the main driver Y in order to rotate therewith, and a set screw '0 is screwed into the ring a and bears against the driver Y to hold the two parts in fixed relationship.

In order to exert a braking or checking effect on the center bearing H for holding the plate or idler 7c of the pawl carrier stationary momentarily, a recess 'w is formed in the plate j and a friction shoe at having a guiding projection y bears against the center bearing H. The guiding projection 3/ of the friction shoe m extends into an aperture 2 in the plate j and a coil spring 2, which bears against the pin 0 at one end and against the projection y at the opposite end, forces the friction shoe 00 against the center bearing H.

In the operation of the hoist so far described, if it be assumed that the driving shaft P is being rotated in the direction of the arrow 3 in Figure 2, the main driver Y will be rotated through a train of gearing described in the direction of the arrow 4 in Figure 2 and the teeth 2? on the annular ring at will bear against the teeth 8 of the pawl 79 and positively move the pawl into engagement with one of the teeth 6 and thereby drive the drum a in a counter-clockwise direction. It will be seen that the entire driving power is transmitted directly from the teeth 6 of the ring a to the pawl 79 and the pawl carrier merely serves to carry the pawl and receives no part of the driving thrust.

Upon reversal of the direction of the driving shaft P, the direction of rotation of the main driver Y will be reversed and the teeth t on the annular ring at will positively rock the pawl go so that the engaging surface 9" will be rocked into engagement with the tooth g on the drum Z. The friction shoe a: will hold the plates or idlers 7' and 7c of the pawl carrier stationary momentarily in order to permit the teeth t to rock the pawl pinto engagement with a tooth on one or the other of the drum drivers before the driving power is transmitted from the main driver to one or the other of the drums. Whenever the direction of rotation of the driving shaft P is reversed, the pawl carrier is held stationary momentarily to permit the teeth t of the ring at to rock the pawl into engagement with a tooth on one or the other of the drums and thereafter the pawl carrier, pawl, annular ring a, together with the teeth 25 and s on the annular ring u and the pawl 79 respectively rotate as a unit about the driving shaft P. One drum or the other will thus be automatically connected to the main driver Y from the driving shaft as often as the direction of rotation of the driving shaft is reversed.

The haulage drum a may be conveniently provided with a flange 5 to which a brake band 6 is applied, being controlled by any suitable mechanical connection from a brake lever 7. The actual mechanical connection between the brake lever 7 and brake band 6 is not shown in the drawing as it forms no part of the present invention, Similarly, a brake band 8 is applied to a flange 9 on the tail rope drum Z and is suitably connected to be operated by a brake lever 10.

I claim:

1. In a hoist, the combination of a frame, a driving shaft, drums rotatable about said driving shaft, a motor connected for rotating said driving shaft, drivers on said drums, a main driver connected to be rotated by the driving shaft, an oscillating pawl associated with the main driver for automatically connecting said main driver with one or the other of said drums in accordance with the direction of rotation of the driving shaft, and positive means including longitudinal gear teeth independent of the op posed drivers for rocking said pawl through a plane transverse to the longitudinal axis of the hoist to engage one or the other of said drivers.

2. In a hoist, the combination of a frame, a driving shaft, a pair of drums rotatable about saiddriving shaft, a motor connected for rotating said driving shaft, opposed drivers carried by said drums respectively, a main driver connected to be rotated by the driving shaft, a pawl carrier rotatable about said driving shaft, a pawl pivoted to said carrier to rock through a transverse plane for automatically connecting said main driver with one or the other of said opposed drivers in accordance with the direction of rotation of the driving shaft, a ring secured to said main driver, and longitudinal gear teeth on said ring to engage the pawl for rocking said pawl into engagement with one or the other of said opposed drivers.

3. In a hoist, the combination of a frame, a driving shaft, a pair of drums rotatable about said driving shaft, a motor connected to rotate the driving shaft, opposed drivers carried by said drums respectively, a main driver connected to be rotated by said driving shaft, a pawl carrier rotatable about said driving shaft, a pawl between the drums and pivoted on said carrier to rock through a transverse plane for automatically connecting the main driver with one or the other of said opposed drivers in accordance with the direction of rotation of the driving shaft, longitudinal gear teeth on said pawl, a ring on said main driver and rotatable therewith, and longitudinal gear teeth on said ring meshing with the teeth on the pawl for rocking said pawl into positive engagement with one or the other of said opposed drivers.

In testimony whereof I have signed this specification.

EARL B. LEAR. 

